Melt blending of poly(butylene succinate) (PBS) with poly(lactic acid) (PLA) to fine tune the mechanical
properties of PLA needs to be aware of immiscibility. The present work proposed the random poly(-
butylene succinate-co-lactic acid) (rPBSL), and for the first time about its multi-functions as compatibilizer,
plasticizer, and film clarity enhancer. Based on PLA/PBS (80/20%wt) with rPBSL (3e5 phr), the
films obtained show the smooth surface with compatibility and clarity. A significant decrease in Tg (from
52 C to 43 C) and a noteworthy increase in elongation at break (four-fold) confirms the role of plasticizer.
A decrease in Tc (from 103 C to 85 C), together with increases in degree of crystallinity and
spherulite growth rate with homogeneously dispersed spherulite suggests how the rPBSL effectively
induces rapid nucleation. By balancing the crystal and amorphous domains including the initiation of
rapid and small spherulites, it is seen that rPBSL performs as a multi-functional additive for PLA/PBS
blends.